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參數(shù)資料
| 型號： | MC68HC708MP16 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 28/44頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
AN1712
28
MOTOROLA
Since the motor phases are connected between the top and bottom
transistors, dead-time insertion is not required. Operating in
independent mode with edge-aligned PWMs would thus be a logical
selection, yielding a PWM resolution of 125 ns for a bus frequency of 8
MHz.
Figure 14
shows typical current waveforms for a 4-phase SR motor
[3]
.
Waveshaping could once again be obtained using a waveform table as
described in the application section on induction motors. To preserve
processor bandwidth, the software can elect to disable current
waveshaping at higher RPMs in favor of a simpler "stepper" type of
control scheme.
Figure 14. Typical Current Waveforms of a 4-Phase SR Motor
Multiple DC Motor Control
The PWM module in the 'MP16 has been designed to accommodate
more than one power stage, as shown in the example in
Figure 15
. For
this configuration, the DISMAP register would be programmed to $44
hex. Since the fault logic is comprised of two separate banks, the current
in each motor can be controlled independently on a cycle-by-cycle basis
by programming fault inputs 2 and 4 for automatic mode. A bus over-
voltage could be caused by either motor, so the voltage-sensing circuitry
must be connected in such a way that an over-voltage fault disables both
banks of PWMs.
90 DEGREES
PHASE 1
PHASE 2
PHASE 3
PHASE 4
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